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共66条，第1-20条
EurekAlert 1176 Science Daily 323 RAND Corporation 304
United States Depart 263 U.S. Energy Informat 231 Science 214
US Environmental Pro 156 The Associated Press 111 Center for Strategic 109
US Geological Survey 83 Minging.com 76 National Academies P 61
Convention on Biolog 56 National Science Fou 50 Department of Energy 38
Scientific American 37 World Resources Inst 33 NASA Global Climate 32
National Bureau of A 28 Seismological Societ 19